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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PF_INET protocol family socket handler. | |
7 | * | |
8 | * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $ | |
9 | * | |
10 | * Authors: Ross Biro, <bir7@leland.Stanford.Edu> | |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> | |
12 | * Florian La Roche, <flla@stud.uni-sb.de> | |
13 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
14 | * | |
15 | * Changes (see also sock.c) | |
16 | * | |
17 | * piggy, | |
18 | * Karl Knutson : Socket protocol table | |
19 | * A.N.Kuznetsov : Socket death error in accept(). | |
20 | * John Richardson : Fix non blocking error in connect() | |
21 | * so sockets that fail to connect | |
22 | * don't return -EINPROGRESS. | |
23 | * Alan Cox : Asynchronous I/O support | |
24 | * Alan Cox : Keep correct socket pointer on sock | |
25 | * structures | |
26 | * when accept() ed | |
27 | * Alan Cox : Semantics of SO_LINGER aren't state | |
28 | * moved to close when you look carefully. | |
29 | * With this fixed and the accept bug fixed | |
30 | * some RPC stuff seems happier. | |
31 | * Niibe Yutaka : 4.4BSD style write async I/O | |
32 | * Alan Cox, | |
33 | * Tony Gale : Fixed reuse semantics. | |
34 | * Alan Cox : bind() shouldn't abort existing but dead | |
35 | * sockets. Stops FTP netin:.. I hope. | |
36 | * Alan Cox : bind() works correctly for RAW sockets. | |
37 | * Note that FreeBSD at least was broken | |
38 | * in this respect so be careful with | |
39 | * compatibility tests... | |
40 | * Alan Cox : routing cache support | |
41 | * Alan Cox : memzero the socket structure for | |
42 | * compactness. | |
43 | * Matt Day : nonblock connect error handler | |
44 | * Alan Cox : Allow large numbers of pending sockets | |
45 | * (eg for big web sites), but only if | |
46 | * specifically application requested. | |
47 | * Alan Cox : New buffering throughout IP. Used | |
48 | * dumbly. | |
49 | * Alan Cox : New buffering now used smartly. | |
50 | * Alan Cox : BSD rather than common sense | |
51 | * interpretation of listen. | |
52 | * Germano Caronni : Assorted small races. | |
53 | * Alan Cox : sendmsg/recvmsg basic support. | |
54 | * Alan Cox : Only sendmsg/recvmsg now supported. | |
55 | * Alan Cox : Locked down bind (see security list). | |
56 | * Alan Cox : Loosened bind a little. | |
57 | * Mike McLagan : ADD/DEL DLCI Ioctls | |
58 | * Willy Konynenberg : Transparent proxying support. | |
59 | * David S. Miller : New socket lookup architecture. | |
60 | * Some other random speedups. | |
61 | * Cyrus Durgin : Cleaned up file for kmod hacks. | |
62 | * Andi Kleen : Fix inet_stream_connect TCP race. | |
63 | * | |
64 | * This program is free software; you can redistribute it and/or | |
65 | * modify it under the terms of the GNU General Public License | |
66 | * as published by the Free Software Foundation; either version | |
67 | * 2 of the License, or (at your option) any later version. | |
68 | */ | |
69 | ||
70 | #include <linux/config.h> | |
71 | #include <linux/errno.h> | |
72 | #include <linux/types.h> | |
73 | #include <linux/socket.h> | |
74 | #include <linux/in.h> | |
75 | #include <linux/kernel.h> | |
76 | #include <linux/major.h> | |
77 | #include <linux/module.h> | |
78 | #include <linux/sched.h> | |
79 | #include <linux/timer.h> | |
80 | #include <linux/string.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/net.h> | |
83 | #include <linux/fcntl.h> | |
84 | #include <linux/mm.h> | |
85 | #include <linux/interrupt.h> | |
86 | #include <linux/stat.h> | |
87 | #include <linux/init.h> | |
88 | #include <linux/poll.h> | |
89 | #include <linux/netfilter_ipv4.h> | |
90 | ||
91 | #include <asm/uaccess.h> | |
92 | #include <asm/system.h> | |
93 | ||
94 | #include <linux/smp_lock.h> | |
95 | #include <linux/inet.h> | |
96 | #include <linux/igmp.h> | |
97 | #include <linux/netdevice.h> | |
98 | #include <net/ip.h> | |
99 | #include <net/protocol.h> | |
100 | #include <net/arp.h> | |
101 | #include <net/route.h> | |
102 | #include <net/ip_fib.h> | |
103 | #include <net/tcp.h> | |
104 | #include <net/udp.h> | |
105 | #include <linux/skbuff.h> | |
106 | #include <net/sock.h> | |
107 | #include <net/raw.h> | |
108 | #include <net/icmp.h> | |
109 | #include <net/ipip.h> | |
110 | #include <net/inet_common.h> | |
111 | #include <net/xfrm.h> | |
112 | #ifdef CONFIG_IP_MROUTE | |
113 | #include <linux/mroute.h> | |
114 | #endif | |
115 | ||
116 | DEFINE_SNMP_STAT(struct linux_mib, net_statistics); | |
117 | ||
118 | #ifdef INET_REFCNT_DEBUG | |
119 | atomic_t inet_sock_nr; | |
120 | #endif | |
121 | ||
122 | extern void ip_mc_drop_socket(struct sock *sk); | |
123 | ||
124 | /* The inetsw table contains everything that inet_create needs to | |
125 | * build a new socket. | |
126 | */ | |
127 | static struct list_head inetsw[SOCK_MAX]; | |
128 | static DEFINE_SPINLOCK(inetsw_lock); | |
129 | ||
130 | /* New destruction routine */ | |
131 | ||
132 | void inet_sock_destruct(struct sock *sk) | |
133 | { | |
134 | struct inet_sock *inet = inet_sk(sk); | |
135 | ||
136 | __skb_queue_purge(&sk->sk_receive_queue); | |
137 | __skb_queue_purge(&sk->sk_error_queue); | |
138 | ||
139 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { | |
140 | printk("Attempt to release TCP socket in state %d %p\n", | |
141 | sk->sk_state, sk); | |
142 | return; | |
143 | } | |
144 | if (!sock_flag(sk, SOCK_DEAD)) { | |
145 | printk("Attempt to release alive inet socket %p\n", sk); | |
146 | return; | |
147 | } | |
148 | ||
149 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
150 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
151 | BUG_TRAP(!sk->sk_wmem_queued); | |
152 | BUG_TRAP(!sk->sk_forward_alloc); | |
153 | ||
154 | if (inet->opt) | |
155 | kfree(inet->opt); | |
156 | dst_release(sk->sk_dst_cache); | |
157 | #ifdef INET_REFCNT_DEBUG | |
158 | atomic_dec(&inet_sock_nr); | |
159 | printk(KERN_DEBUG "INET socket %p released, %d are still alive\n", | |
160 | sk, atomic_read(&inet_sock_nr)); | |
161 | #endif | |
162 | } | |
163 | ||
164 | /* | |
165 | * The routines beyond this point handle the behaviour of an AF_INET | |
166 | * socket object. Mostly it punts to the subprotocols of IP to do | |
167 | * the work. | |
168 | */ | |
169 | ||
170 | /* | |
171 | * Automatically bind an unbound socket. | |
172 | */ | |
173 | ||
174 | static int inet_autobind(struct sock *sk) | |
175 | { | |
176 | struct inet_sock *inet; | |
177 | /* We may need to bind the socket. */ | |
178 | lock_sock(sk); | |
179 | inet = inet_sk(sk); | |
180 | if (!inet->num) { | |
181 | if (sk->sk_prot->get_port(sk, 0)) { | |
182 | release_sock(sk); | |
183 | return -EAGAIN; | |
184 | } | |
185 | inet->sport = htons(inet->num); | |
186 | } | |
187 | release_sock(sk); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Move a socket into listening state. | |
193 | */ | |
194 | int inet_listen(struct socket *sock, int backlog) | |
195 | { | |
196 | struct sock *sk = sock->sk; | |
197 | unsigned char old_state; | |
198 | int err; | |
199 | ||
200 | lock_sock(sk); | |
201 | ||
202 | err = -EINVAL; | |
203 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) | |
204 | goto out; | |
205 | ||
206 | old_state = sk->sk_state; | |
207 | if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
208 | goto out; | |
209 | ||
210 | /* Really, if the socket is already in listen state | |
211 | * we can only allow the backlog to be adjusted. | |
212 | */ | |
213 | if (old_state != TCP_LISTEN) { | |
214 | err = tcp_listen_start(sk); | |
215 | if (err) | |
216 | goto out; | |
217 | } | |
218 | sk->sk_max_ack_backlog = backlog; | |
219 | err = 0; | |
220 | ||
221 | out: | |
222 | release_sock(sk); | |
223 | return err; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Create an inet socket. | |
228 | */ | |
229 | ||
230 | static int inet_create(struct socket *sock, int protocol) | |
231 | { | |
232 | struct sock *sk; | |
233 | struct list_head *p; | |
234 | struct inet_protosw *answer; | |
235 | struct inet_sock *inet; | |
236 | struct proto *answer_prot; | |
237 | unsigned char answer_flags; | |
238 | char answer_no_check; | |
239 | int err; | |
240 | ||
241 | sock->state = SS_UNCONNECTED; | |
242 | ||
243 | /* Look for the requested type/protocol pair. */ | |
244 | answer = NULL; | |
245 | rcu_read_lock(); | |
246 | list_for_each_rcu(p, &inetsw[sock->type]) { | |
247 | answer = list_entry(p, struct inet_protosw, list); | |
248 | ||
249 | /* Check the non-wild match. */ | |
250 | if (protocol == answer->protocol) { | |
251 | if (protocol != IPPROTO_IP) | |
252 | break; | |
253 | } else { | |
254 | /* Check for the two wild cases. */ | |
255 | if (IPPROTO_IP == protocol) { | |
256 | protocol = answer->protocol; | |
257 | break; | |
258 | } | |
259 | if (IPPROTO_IP == answer->protocol) | |
260 | break; | |
261 | } | |
262 | answer = NULL; | |
263 | } | |
264 | ||
265 | err = -ESOCKTNOSUPPORT; | |
266 | if (!answer) | |
267 | goto out_rcu_unlock; | |
268 | err = -EPERM; | |
269 | if (answer->capability > 0 && !capable(answer->capability)) | |
270 | goto out_rcu_unlock; | |
271 | err = -EPROTONOSUPPORT; | |
272 | if (!protocol) | |
273 | goto out_rcu_unlock; | |
274 | ||
275 | sock->ops = answer->ops; | |
276 | answer_prot = answer->prot; | |
277 | answer_no_check = answer->no_check; | |
278 | answer_flags = answer->flags; | |
279 | rcu_read_unlock(); | |
280 | ||
281 | BUG_TRAP(answer_prot->slab != NULL); | |
282 | ||
283 | err = -ENOBUFS; | |
284 | sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1); | |
285 | if (sk == NULL) | |
286 | goto out; | |
287 | ||
288 | err = 0; | |
289 | sk->sk_no_check = answer_no_check; | |
290 | if (INET_PROTOSW_REUSE & answer_flags) | |
291 | sk->sk_reuse = 1; | |
292 | ||
293 | inet = inet_sk(sk); | |
294 | ||
295 | if (SOCK_RAW == sock->type) { | |
296 | inet->num = protocol; | |
297 | if (IPPROTO_RAW == protocol) | |
298 | inet->hdrincl = 1; | |
299 | } | |
300 | ||
301 | if (ipv4_config.no_pmtu_disc) | |
302 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
303 | else | |
304 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
305 | ||
306 | inet->id = 0; | |
307 | ||
308 | sock_init_data(sock, sk); | |
309 | ||
310 | sk->sk_destruct = inet_sock_destruct; | |
311 | sk->sk_family = PF_INET; | |
312 | sk->sk_protocol = protocol; | |
313 | sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
314 | ||
315 | inet->uc_ttl = -1; | |
316 | inet->mc_loop = 1; | |
317 | inet->mc_ttl = 1; | |
318 | inet->mc_index = 0; | |
319 | inet->mc_list = NULL; | |
320 | ||
321 | #ifdef INET_REFCNT_DEBUG | |
322 | atomic_inc(&inet_sock_nr); | |
323 | #endif | |
324 | ||
325 | if (inet->num) { | |
326 | /* It assumes that any protocol which allows | |
327 | * the user to assign a number at socket | |
328 | * creation time automatically | |
329 | * shares. | |
330 | */ | |
331 | inet->sport = htons(inet->num); | |
332 | /* Add to protocol hash chains. */ | |
333 | sk->sk_prot->hash(sk); | |
334 | } | |
335 | ||
336 | if (sk->sk_prot->init) { | |
337 | err = sk->sk_prot->init(sk); | |
338 | if (err) | |
339 | sk_common_release(sk); | |
340 | } | |
341 | out: | |
342 | return err; | |
343 | out_rcu_unlock: | |
344 | rcu_read_unlock(); | |
345 | goto out; | |
346 | } | |
347 | ||
348 | ||
349 | /* | |
350 | * The peer socket should always be NULL (or else). When we call this | |
351 | * function we are destroying the object and from then on nobody | |
352 | * should refer to it. | |
353 | */ | |
354 | int inet_release(struct socket *sock) | |
355 | { | |
356 | struct sock *sk = sock->sk; | |
357 | ||
358 | if (sk) { | |
359 | long timeout; | |
360 | ||
361 | /* Applications forget to leave groups before exiting */ | |
362 | ip_mc_drop_socket(sk); | |
363 | ||
364 | /* If linger is set, we don't return until the close | |
365 | * is complete. Otherwise we return immediately. The | |
366 | * actually closing is done the same either way. | |
367 | * | |
368 | * If the close is due to the process exiting, we never | |
369 | * linger.. | |
370 | */ | |
371 | timeout = 0; | |
372 | if (sock_flag(sk, SOCK_LINGER) && | |
373 | !(current->flags & PF_EXITING)) | |
374 | timeout = sk->sk_lingertime; | |
375 | sock->sk = NULL; | |
376 | sk->sk_prot->close(sk, timeout); | |
377 | } | |
378 | return 0; | |
379 | } | |
380 | ||
381 | /* It is off by default, see below. */ | |
382 | int sysctl_ip_nonlocal_bind; | |
383 | ||
384 | int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
385 | { | |
386 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
387 | struct sock *sk = sock->sk; | |
388 | struct inet_sock *inet = inet_sk(sk); | |
389 | unsigned short snum; | |
390 | int chk_addr_ret; | |
391 | int err; | |
392 | ||
393 | /* If the socket has its own bind function then use it. (RAW) */ | |
394 | if (sk->sk_prot->bind) { | |
395 | err = sk->sk_prot->bind(sk, uaddr, addr_len); | |
396 | goto out; | |
397 | } | |
398 | err = -EINVAL; | |
399 | if (addr_len < sizeof(struct sockaddr_in)) | |
400 | goto out; | |
401 | ||
402 | chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); | |
403 | ||
404 | /* Not specified by any standard per-se, however it breaks too | |
405 | * many applications when removed. It is unfortunate since | |
406 | * allowing applications to make a non-local bind solves | |
407 | * several problems with systems using dynamic addressing. | |
408 | * (ie. your servers still start up even if your ISDN link | |
409 | * is temporarily down) | |
410 | */ | |
411 | err = -EADDRNOTAVAIL; | |
412 | if (!sysctl_ip_nonlocal_bind && | |
413 | !inet->freebind && | |
414 | addr->sin_addr.s_addr != INADDR_ANY && | |
415 | chk_addr_ret != RTN_LOCAL && | |
416 | chk_addr_ret != RTN_MULTICAST && | |
417 | chk_addr_ret != RTN_BROADCAST) | |
418 | goto out; | |
419 | ||
420 | snum = ntohs(addr->sin_port); | |
421 | err = -EACCES; | |
422 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
423 | goto out; | |
424 | ||
425 | /* We keep a pair of addresses. rcv_saddr is the one | |
426 | * used by hash lookups, and saddr is used for transmit. | |
427 | * | |
428 | * In the BSD API these are the same except where it | |
429 | * would be illegal to use them (multicast/broadcast) in | |
430 | * which case the sending device address is used. | |
431 | */ | |
432 | lock_sock(sk); | |
433 | ||
434 | /* Check these errors (active socket, double bind). */ | |
435 | err = -EINVAL; | |
436 | if (sk->sk_state != TCP_CLOSE || inet->num) | |
437 | goto out_release_sock; | |
438 | ||
439 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; | |
440 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
441 | inet->saddr = 0; /* Use device */ | |
442 | ||
443 | /* Make sure we are allowed to bind here. */ | |
444 | if (sk->sk_prot->get_port(sk, snum)) { | |
445 | inet->saddr = inet->rcv_saddr = 0; | |
446 | err = -EADDRINUSE; | |
447 | goto out_release_sock; | |
448 | } | |
449 | ||
450 | if (inet->rcv_saddr) | |
451 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
452 | if (snum) | |
453 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
454 | inet->sport = htons(inet->num); | |
455 | inet->daddr = 0; | |
456 | inet->dport = 0; | |
457 | sk_dst_reset(sk); | |
458 | err = 0; | |
459 | out_release_sock: | |
460 | release_sock(sk); | |
461 | out: | |
462 | return err; | |
463 | } | |
464 | ||
465 | int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, | |
466 | int addr_len, int flags) | |
467 | { | |
468 | struct sock *sk = sock->sk; | |
469 | ||
470 | if (uaddr->sa_family == AF_UNSPEC) | |
471 | return sk->sk_prot->disconnect(sk, flags); | |
472 | ||
473 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
474 | return -EAGAIN; | |
475 | return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); | |
476 | } | |
477 | ||
478 | static long inet_wait_for_connect(struct sock *sk, long timeo) | |
479 | { | |
480 | DEFINE_WAIT(wait); | |
481 | ||
482 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
483 | ||
484 | /* Basic assumption: if someone sets sk->sk_err, he _must_ | |
485 | * change state of the socket from TCP_SYN_*. | |
486 | * Connect() does not allow to get error notifications | |
487 | * without closing the socket. | |
488 | */ | |
489 | while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
490 | release_sock(sk); | |
491 | timeo = schedule_timeout(timeo); | |
492 | lock_sock(sk); | |
493 | if (signal_pending(current) || !timeo) | |
494 | break; | |
495 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
496 | } | |
497 | finish_wait(sk->sk_sleep, &wait); | |
498 | return timeo; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Connect to a remote host. There is regrettably still a little | |
503 | * TCP 'magic' in here. | |
504 | */ | |
505 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
506 | int addr_len, int flags) | |
507 | { | |
508 | struct sock *sk = sock->sk; | |
509 | int err; | |
510 | long timeo; | |
511 | ||
512 | lock_sock(sk); | |
513 | ||
514 | if (uaddr->sa_family == AF_UNSPEC) { | |
515 | err = sk->sk_prot->disconnect(sk, flags); | |
516 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
517 | goto out; | |
518 | } | |
519 | ||
520 | switch (sock->state) { | |
521 | default: | |
522 | err = -EINVAL; | |
523 | goto out; | |
524 | case SS_CONNECTED: | |
525 | err = -EISCONN; | |
526 | goto out; | |
527 | case SS_CONNECTING: | |
528 | err = -EALREADY; | |
529 | /* Fall out of switch with err, set for this state */ | |
530 | break; | |
531 | case SS_UNCONNECTED: | |
532 | err = -EISCONN; | |
533 | if (sk->sk_state != TCP_CLOSE) | |
534 | goto out; | |
535 | ||
536 | err = sk->sk_prot->connect(sk, uaddr, addr_len); | |
537 | if (err < 0) | |
538 | goto out; | |
539 | ||
540 | sock->state = SS_CONNECTING; | |
541 | ||
542 | /* Just entered SS_CONNECTING state; the only | |
543 | * difference is that return value in non-blocking | |
544 | * case is EINPROGRESS, rather than EALREADY. | |
545 | */ | |
546 | err = -EINPROGRESS; | |
547 | break; | |
548 | } | |
549 | ||
550 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
551 | ||
552 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
553 | /* Error code is set above */ | |
554 | if (!timeo || !inet_wait_for_connect(sk, timeo)) | |
555 | goto out; | |
556 | ||
557 | err = sock_intr_errno(timeo); | |
558 | if (signal_pending(current)) | |
559 | goto out; | |
560 | } | |
561 | ||
562 | /* Connection was closed by RST, timeout, ICMP error | |
563 | * or another process disconnected us. | |
564 | */ | |
565 | if (sk->sk_state == TCP_CLOSE) | |
566 | goto sock_error; | |
567 | ||
568 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user | |
569 | * and error was received after socket entered established state. | |
570 | * Hence, it is handled normally after connect() return successfully. | |
571 | */ | |
572 | ||
573 | sock->state = SS_CONNECTED; | |
574 | err = 0; | |
575 | out: | |
576 | release_sock(sk); | |
577 | return err; | |
578 | ||
579 | sock_error: | |
580 | err = sock_error(sk) ? : -ECONNABORTED; | |
581 | sock->state = SS_UNCONNECTED; | |
582 | if (sk->sk_prot->disconnect(sk, flags)) | |
583 | sock->state = SS_DISCONNECTING; | |
584 | goto out; | |
585 | } | |
586 | ||
587 | /* | |
588 | * Accept a pending connection. The TCP layer now gives BSD semantics. | |
589 | */ | |
590 | ||
591 | int inet_accept(struct socket *sock, struct socket *newsock, int flags) | |
592 | { | |
593 | struct sock *sk1 = sock->sk; | |
594 | int err = -EINVAL; | |
595 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); | |
596 | ||
597 | if (!sk2) | |
598 | goto do_err; | |
599 | ||
600 | lock_sock(sk2); | |
601 | ||
602 | BUG_TRAP((1 << sk2->sk_state) & | |
603 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); | |
604 | ||
605 | sock_graft(sk2, newsock); | |
606 | ||
607 | newsock->state = SS_CONNECTED; | |
608 | err = 0; | |
609 | release_sock(sk2); | |
610 | do_err: | |
611 | return err; | |
612 | } | |
613 | ||
614 | ||
615 | /* | |
616 | * This does both peername and sockname. | |
617 | */ | |
618 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, | |
619 | int *uaddr_len, int peer) | |
620 | { | |
621 | struct sock *sk = sock->sk; | |
622 | struct inet_sock *inet = inet_sk(sk); | |
623 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
624 | ||
625 | sin->sin_family = AF_INET; | |
626 | if (peer) { | |
627 | if (!inet->dport || | |
628 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
629 | peer == 1)) | |
630 | return -ENOTCONN; | |
631 | sin->sin_port = inet->dport; | |
632 | sin->sin_addr.s_addr = inet->daddr; | |
633 | } else { | |
634 | __u32 addr = inet->rcv_saddr; | |
635 | if (!addr) | |
636 | addr = inet->saddr; | |
637 | sin->sin_port = inet->sport; | |
638 | sin->sin_addr.s_addr = addr; | |
639 | } | |
640 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
641 | *uaddr_len = sizeof(*sin); | |
642 | return 0; | |
643 | } | |
644 | ||
645 | int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
646 | size_t size) | |
647 | { | |
648 | struct sock *sk = sock->sk; | |
649 | ||
650 | /* We may need to bind the socket. */ | |
651 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
652 | return -EAGAIN; | |
653 | ||
654 | return sk->sk_prot->sendmsg(iocb, sk, msg, size); | |
655 | } | |
656 | ||
657 | ||
658 | static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
659 | { | |
660 | struct sock *sk = sock->sk; | |
661 | ||
662 | /* We may need to bind the socket. */ | |
663 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
664 | return -EAGAIN; | |
665 | ||
666 | if (sk->sk_prot->sendpage) | |
667 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); | |
668 | return sock_no_sendpage(sock, page, offset, size, flags); | |
669 | } | |
670 | ||
671 | ||
672 | int inet_shutdown(struct socket *sock, int how) | |
673 | { | |
674 | struct sock *sk = sock->sk; | |
675 | int err = 0; | |
676 | ||
677 | /* This should really check to make sure | |
678 | * the socket is a TCP socket. (WHY AC...) | |
679 | */ | |
680 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and | |
681 | 1->2 bit 2 snds. | |
682 | 2->3 */ | |
683 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ | |
684 | return -EINVAL; | |
685 | ||
686 | lock_sock(sk); | |
687 | if (sock->state == SS_CONNECTING) { | |
688 | if ((1 << sk->sk_state) & | |
689 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
690 | sock->state = SS_DISCONNECTING; | |
691 | else | |
692 | sock->state = SS_CONNECTED; | |
693 | } | |
694 | ||
695 | switch (sk->sk_state) { | |
696 | case TCP_CLOSE: | |
697 | err = -ENOTCONN; | |
698 | /* Hack to wake up other listeners, who can poll for | |
699 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ | |
700 | default: | |
701 | sk->sk_shutdown |= how; | |
702 | if (sk->sk_prot->shutdown) | |
703 | sk->sk_prot->shutdown(sk, how); | |
704 | break; | |
705 | ||
706 | /* Remaining two branches are temporary solution for missing | |
707 | * close() in multithreaded environment. It is _not_ a good idea, | |
708 | * but we have no choice until close() is repaired at VFS level. | |
709 | */ | |
710 | case TCP_LISTEN: | |
711 | if (!(how & RCV_SHUTDOWN)) | |
712 | break; | |
713 | /* Fall through */ | |
714 | case TCP_SYN_SENT: | |
715 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); | |
716 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
717 | break; | |
718 | } | |
719 | ||
720 | /* Wake up anyone sleeping in poll. */ | |
721 | sk->sk_state_change(sk); | |
722 | release_sock(sk); | |
723 | return err; | |
724 | } | |
725 | ||
726 | /* | |
727 | * ioctl() calls you can issue on an INET socket. Most of these are | |
728 | * device configuration and stuff and very rarely used. Some ioctls | |
729 | * pass on to the socket itself. | |
730 | * | |
731 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig | |
732 | * loads the devconfigure module does its configuring and unloads it. | |
733 | * There's a good 20K of config code hanging around the kernel. | |
734 | */ | |
735 | ||
736 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
737 | { | |
738 | struct sock *sk = sock->sk; | |
739 | int err = 0; | |
740 | ||
741 | switch (cmd) { | |
742 | case SIOCGSTAMP: | |
743 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); | |
744 | break; | |
745 | case SIOCADDRT: | |
746 | case SIOCDELRT: | |
747 | case SIOCRTMSG: | |
748 | err = ip_rt_ioctl(cmd, (void __user *)arg); | |
749 | break; | |
750 | case SIOCDARP: | |
751 | case SIOCGARP: | |
752 | case SIOCSARP: | |
753 | err = arp_ioctl(cmd, (void __user *)arg); | |
754 | break; | |
755 | case SIOCGIFADDR: | |
756 | case SIOCSIFADDR: | |
757 | case SIOCGIFBRDADDR: | |
758 | case SIOCSIFBRDADDR: | |
759 | case SIOCGIFNETMASK: | |
760 | case SIOCSIFNETMASK: | |
761 | case SIOCGIFDSTADDR: | |
762 | case SIOCSIFDSTADDR: | |
763 | case SIOCSIFPFLAGS: | |
764 | case SIOCGIFPFLAGS: | |
765 | case SIOCSIFFLAGS: | |
766 | err = devinet_ioctl(cmd, (void __user *)arg); | |
767 | break; | |
768 | default: | |
769 | if (!sk->sk_prot->ioctl || | |
770 | (err = sk->sk_prot->ioctl(sk, cmd, arg)) == | |
771 | -ENOIOCTLCMD) | |
772 | err = dev_ioctl(cmd, (void __user *)arg); | |
773 | break; | |
774 | } | |
775 | return err; | |
776 | } | |
777 | ||
778 | struct proto_ops inet_stream_ops = { | |
779 | .family = PF_INET, | |
780 | .owner = THIS_MODULE, | |
781 | .release = inet_release, | |
782 | .bind = inet_bind, | |
783 | .connect = inet_stream_connect, | |
784 | .socketpair = sock_no_socketpair, | |
785 | .accept = inet_accept, | |
786 | .getname = inet_getname, | |
787 | .poll = tcp_poll, | |
788 | .ioctl = inet_ioctl, | |
789 | .listen = inet_listen, | |
790 | .shutdown = inet_shutdown, | |
791 | .setsockopt = sock_common_setsockopt, | |
792 | .getsockopt = sock_common_getsockopt, | |
793 | .sendmsg = inet_sendmsg, | |
794 | .recvmsg = sock_common_recvmsg, | |
795 | .mmap = sock_no_mmap, | |
796 | .sendpage = tcp_sendpage | |
797 | }; | |
798 | ||
799 | struct proto_ops inet_dgram_ops = { | |
800 | .family = PF_INET, | |
801 | .owner = THIS_MODULE, | |
802 | .release = inet_release, | |
803 | .bind = inet_bind, | |
804 | .connect = inet_dgram_connect, | |
805 | .socketpair = sock_no_socketpair, | |
806 | .accept = sock_no_accept, | |
807 | .getname = inet_getname, | |
808 | .poll = udp_poll, | |
809 | .ioctl = inet_ioctl, | |
810 | .listen = sock_no_listen, | |
811 | .shutdown = inet_shutdown, | |
812 | .setsockopt = sock_common_setsockopt, | |
813 | .getsockopt = sock_common_getsockopt, | |
814 | .sendmsg = inet_sendmsg, | |
815 | .recvmsg = sock_common_recvmsg, | |
816 | .mmap = sock_no_mmap, | |
817 | .sendpage = inet_sendpage, | |
818 | }; | |
819 | ||
820 | /* | |
821 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without | |
822 | * udp_poll | |
823 | */ | |
824 | static struct proto_ops inet_sockraw_ops = { | |
825 | .family = PF_INET, | |
826 | .owner = THIS_MODULE, | |
827 | .release = inet_release, | |
828 | .bind = inet_bind, | |
829 | .connect = inet_dgram_connect, | |
830 | .socketpair = sock_no_socketpair, | |
831 | .accept = sock_no_accept, | |
832 | .getname = inet_getname, | |
833 | .poll = datagram_poll, | |
834 | .ioctl = inet_ioctl, | |
835 | .listen = sock_no_listen, | |
836 | .shutdown = inet_shutdown, | |
837 | .setsockopt = sock_common_setsockopt, | |
838 | .getsockopt = sock_common_getsockopt, | |
839 | .sendmsg = inet_sendmsg, | |
840 | .recvmsg = sock_common_recvmsg, | |
841 | .mmap = sock_no_mmap, | |
842 | .sendpage = inet_sendpage, | |
843 | }; | |
844 | ||
845 | static struct net_proto_family inet_family_ops = { | |
846 | .family = PF_INET, | |
847 | .create = inet_create, | |
848 | .owner = THIS_MODULE, | |
849 | }; | |
850 | ||
851 | ||
852 | extern void tcp_init(void); | |
853 | extern void tcp_v4_init(struct net_proto_family *); | |
854 | ||
855 | /* Upon startup we insert all the elements in inetsw_array[] into | |
856 | * the linked list inetsw. | |
857 | */ | |
858 | static struct inet_protosw inetsw_array[] = | |
859 | { | |
860 | { | |
861 | .type = SOCK_STREAM, | |
862 | .protocol = IPPROTO_TCP, | |
863 | .prot = &tcp_prot, | |
864 | .ops = &inet_stream_ops, | |
865 | .capability = -1, | |
866 | .no_check = 0, | |
867 | .flags = INET_PROTOSW_PERMANENT, | |
868 | }, | |
869 | ||
870 | { | |
871 | .type = SOCK_DGRAM, | |
872 | .protocol = IPPROTO_UDP, | |
873 | .prot = &udp_prot, | |
874 | .ops = &inet_dgram_ops, | |
875 | .capability = -1, | |
876 | .no_check = UDP_CSUM_DEFAULT, | |
877 | .flags = INET_PROTOSW_PERMANENT, | |
878 | }, | |
879 | ||
880 | ||
881 | { | |
882 | .type = SOCK_RAW, | |
883 | .protocol = IPPROTO_IP, /* wild card */ | |
884 | .prot = &raw_prot, | |
885 | .ops = &inet_sockraw_ops, | |
886 | .capability = CAP_NET_RAW, | |
887 | .no_check = UDP_CSUM_DEFAULT, | |
888 | .flags = INET_PROTOSW_REUSE, | |
889 | } | |
890 | }; | |
891 | ||
892 | #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw)) | |
893 | ||
894 | void inet_register_protosw(struct inet_protosw *p) | |
895 | { | |
896 | struct list_head *lh; | |
897 | struct inet_protosw *answer; | |
898 | int protocol = p->protocol; | |
899 | struct list_head *last_perm; | |
900 | ||
901 | spin_lock_bh(&inetsw_lock); | |
902 | ||
903 | if (p->type >= SOCK_MAX) | |
904 | goto out_illegal; | |
905 | ||
906 | /* If we are trying to override a permanent protocol, bail. */ | |
907 | answer = NULL; | |
908 | last_perm = &inetsw[p->type]; | |
909 | list_for_each(lh, &inetsw[p->type]) { | |
910 | answer = list_entry(lh, struct inet_protosw, list); | |
911 | ||
912 | /* Check only the non-wild match. */ | |
913 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
914 | if (protocol == answer->protocol) | |
915 | break; | |
916 | last_perm = lh; | |
917 | } | |
918 | ||
919 | answer = NULL; | |
920 | } | |
921 | if (answer) | |
922 | goto out_permanent; | |
923 | ||
924 | /* Add the new entry after the last permanent entry if any, so that | |
925 | * the new entry does not override a permanent entry when matched with | |
926 | * a wild-card protocol. But it is allowed to override any existing | |
927 | * non-permanent entry. This means that when we remove this entry, the | |
928 | * system automatically returns to the old behavior. | |
929 | */ | |
930 | list_add_rcu(&p->list, last_perm); | |
931 | out: | |
932 | spin_unlock_bh(&inetsw_lock); | |
933 | ||
934 | synchronize_net(); | |
935 | ||
936 | return; | |
937 | ||
938 | out_permanent: | |
939 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", | |
940 | protocol); | |
941 | goto out; | |
942 | ||
943 | out_illegal: | |
944 | printk(KERN_ERR | |
945 | "Ignoring attempt to register invalid socket type %d.\n", | |
946 | p->type); | |
947 | goto out; | |
948 | } | |
949 | ||
950 | void inet_unregister_protosw(struct inet_protosw *p) | |
951 | { | |
952 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
953 | printk(KERN_ERR | |
954 | "Attempt to unregister permanent protocol %d.\n", | |
955 | p->protocol); | |
956 | } else { | |
957 | spin_lock_bh(&inetsw_lock); | |
958 | list_del_rcu(&p->list); | |
959 | spin_unlock_bh(&inetsw_lock); | |
960 | ||
961 | synchronize_net(); | |
962 | } | |
963 | } | |
964 | ||
965 | #ifdef CONFIG_IP_MULTICAST | |
966 | static struct net_protocol igmp_protocol = { | |
967 | .handler = igmp_rcv, | |
968 | }; | |
969 | #endif | |
970 | ||
971 | static struct net_protocol tcp_protocol = { | |
972 | .handler = tcp_v4_rcv, | |
973 | .err_handler = tcp_v4_err, | |
974 | .no_policy = 1, | |
975 | }; | |
976 | ||
977 | static struct net_protocol udp_protocol = { | |
978 | .handler = udp_rcv, | |
979 | .err_handler = udp_err, | |
980 | .no_policy = 1, | |
981 | }; | |
982 | ||
983 | static struct net_protocol icmp_protocol = { | |
984 | .handler = icmp_rcv, | |
985 | }; | |
986 | ||
987 | static int __init init_ipv4_mibs(void) | |
988 | { | |
989 | net_statistics[0] = alloc_percpu(struct linux_mib); | |
990 | net_statistics[1] = alloc_percpu(struct linux_mib); | |
991 | ip_statistics[0] = alloc_percpu(struct ipstats_mib); | |
992 | ip_statistics[1] = alloc_percpu(struct ipstats_mib); | |
993 | icmp_statistics[0] = alloc_percpu(struct icmp_mib); | |
994 | icmp_statistics[1] = alloc_percpu(struct icmp_mib); | |
995 | tcp_statistics[0] = alloc_percpu(struct tcp_mib); | |
996 | tcp_statistics[1] = alloc_percpu(struct tcp_mib); | |
997 | udp_statistics[0] = alloc_percpu(struct udp_mib); | |
998 | udp_statistics[1] = alloc_percpu(struct udp_mib); | |
999 | if (! | |
1000 | (net_statistics[0] && net_statistics[1] && ip_statistics[0] | |
1001 | && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1] | |
1002 | && udp_statistics[0] && udp_statistics[1])) | |
1003 | return -ENOMEM; | |
1004 | ||
1005 | (void) tcp_mib_init(); | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static int ipv4_proc_init(void); | |
1011 | extern void ipfrag_init(void); | |
1012 | ||
1013 | static int __init inet_init(void) | |
1014 | { | |
1015 | struct sk_buff *dummy_skb; | |
1016 | struct inet_protosw *q; | |
1017 | struct list_head *r; | |
1018 | int rc = -EINVAL; | |
1019 | ||
1020 | if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) { | |
1021 | printk(KERN_CRIT "%s: panic\n", __FUNCTION__); | |
1022 | goto out; | |
1023 | } | |
1024 | ||
1025 | rc = proto_register(&tcp_prot, 1); | |
1026 | if (rc) | |
1027 | goto out; | |
1028 | ||
1029 | rc = proto_register(&udp_prot, 1); | |
1030 | if (rc) | |
1031 | goto out_unregister_tcp_proto; | |
1032 | ||
1033 | rc = proto_register(&raw_prot, 1); | |
1034 | if (rc) | |
1035 | goto out_unregister_udp_proto; | |
1036 | ||
1037 | /* | |
1038 | * Tell SOCKET that we are alive... | |
1039 | */ | |
1040 | ||
1041 | (void)sock_register(&inet_family_ops); | |
1042 | ||
1043 | /* | |
1044 | * Add all the base protocols. | |
1045 | */ | |
1046 | ||
1047 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) | |
1048 | printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); | |
1049 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) | |
1050 | printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); | |
1051 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) | |
1052 | printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); | |
1053 | #ifdef CONFIG_IP_MULTICAST | |
1054 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) | |
1055 | printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); | |
1056 | #endif | |
1057 | ||
1058 | /* Register the socket-side information for inet_create. */ | |
1059 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) | |
1060 | INIT_LIST_HEAD(r); | |
1061 | ||
1062 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) | |
1063 | inet_register_protosw(q); | |
1064 | ||
1065 | /* | |
1066 | * Set the ARP module up | |
1067 | */ | |
1068 | ||
1069 | arp_init(); | |
1070 | ||
1071 | /* | |
1072 | * Set the IP module up | |
1073 | */ | |
1074 | ||
1075 | ip_init(); | |
1076 | ||
1077 | tcp_v4_init(&inet_family_ops); | |
1078 | ||
1079 | /* Setup TCP slab cache for open requests. */ | |
1080 | tcp_init(); | |
1081 | ||
1082 | ||
1083 | /* | |
1084 | * Set the ICMP layer up | |
1085 | */ | |
1086 | ||
1087 | icmp_init(&inet_family_ops); | |
1088 | ||
1089 | /* | |
1090 | * Initialise the multicast router | |
1091 | */ | |
1092 | #if defined(CONFIG_IP_MROUTE) | |
1093 | ip_mr_init(); | |
1094 | #endif | |
1095 | /* | |
1096 | * Initialise per-cpu ipv4 mibs | |
1097 | */ | |
1098 | ||
1099 | if(init_ipv4_mibs()) | |
1100 | printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; | |
1101 | ||
1102 | ipv4_proc_init(); | |
1103 | ||
1104 | ipfrag_init(); | |
1105 | ||
1106 | rc = 0; | |
1107 | out: | |
1108 | return rc; | |
1109 | out_unregister_tcp_proto: | |
1110 | proto_unregister(&tcp_prot); | |
1111 | out_unregister_udp_proto: | |
1112 | proto_unregister(&udp_prot); | |
1113 | goto out; | |
1114 | } | |
1115 | ||
1116 | module_init(inet_init); | |
1117 | ||
1118 | /* ------------------------------------------------------------------------ */ | |
1119 | ||
1120 | #ifdef CONFIG_PROC_FS | |
1121 | extern int fib_proc_init(void); | |
1122 | extern void fib_proc_exit(void); | |
1123 | extern int ip_misc_proc_init(void); | |
1124 | extern int raw_proc_init(void); | |
1125 | extern void raw_proc_exit(void); | |
1126 | extern int tcp4_proc_init(void); | |
1127 | extern void tcp4_proc_exit(void); | |
1128 | extern int udp4_proc_init(void); | |
1129 | extern void udp4_proc_exit(void); | |
1130 | ||
1131 | static int __init ipv4_proc_init(void) | |
1132 | { | |
1133 | int rc = 0; | |
1134 | ||
1135 | if (raw_proc_init()) | |
1136 | goto out_raw; | |
1137 | if (tcp4_proc_init()) | |
1138 | goto out_tcp; | |
1139 | if (udp4_proc_init()) | |
1140 | goto out_udp; | |
1141 | if (fib_proc_init()) | |
1142 | goto out_fib; | |
1143 | if (ip_misc_proc_init()) | |
1144 | goto out_misc; | |
1145 | out: | |
1146 | return rc; | |
1147 | out_misc: | |
1148 | fib_proc_exit(); | |
1149 | out_fib: | |
1150 | udp4_proc_exit(); | |
1151 | out_udp: | |
1152 | tcp4_proc_exit(); | |
1153 | out_tcp: | |
1154 | raw_proc_exit(); | |
1155 | out_raw: | |
1156 | rc = -ENOMEM; | |
1157 | goto out; | |
1158 | } | |
1159 | ||
1160 | #else /* CONFIG_PROC_FS */ | |
1161 | static int __init ipv4_proc_init(void) | |
1162 | { | |
1163 | return 0; | |
1164 | } | |
1165 | #endif /* CONFIG_PROC_FS */ | |
1166 | ||
1167 | MODULE_ALIAS_NETPROTO(PF_INET); | |
1168 | ||
1169 | EXPORT_SYMBOL(inet_accept); | |
1170 | EXPORT_SYMBOL(inet_bind); | |
1171 | EXPORT_SYMBOL(inet_dgram_connect); | |
1172 | EXPORT_SYMBOL(inet_dgram_ops); | |
1173 | EXPORT_SYMBOL(inet_getname); | |
1174 | EXPORT_SYMBOL(inet_ioctl); | |
1175 | EXPORT_SYMBOL(inet_listen); | |
1176 | EXPORT_SYMBOL(inet_register_protosw); | |
1177 | EXPORT_SYMBOL(inet_release); | |
1178 | EXPORT_SYMBOL(inet_sendmsg); | |
1179 | EXPORT_SYMBOL(inet_shutdown); | |
1180 | EXPORT_SYMBOL(inet_sock_destruct); | |
1181 | EXPORT_SYMBOL(inet_stream_connect); | |
1182 | EXPORT_SYMBOL(inet_stream_ops); | |
1183 | EXPORT_SYMBOL(inet_unregister_protosw); | |
1184 | EXPORT_SYMBOL(net_statistics); | |
1185 | ||
1186 | #ifdef INET_REFCNT_DEBUG | |
1187 | EXPORT_SYMBOL(inet_sock_nr); | |
1188 | #endif |